https://longnow.org/ideas/controlling-nature-might-be-in-our-nature/

This is an example of a web page that uses a lot of CPU time, on a laptop with 
a i5-6300U running KDE with Wayland it takes 50% of a CPU core for the total 
of the WebKitWebProces and epiphany processes and it makes kwin_wayland take 
over 10% when the above web page is visible.  To reproduce this the web page 
in question has to be in a foreground tab and the web browser window has to be 
visible.  Putting another tab in the foreground or putting another window in 
front of the browser reduces it to almost zero.

On a PinePhonePro this page takes almost 100% of a CPU core between the two 
processes for Epiphany and runs the battery out quickly.

Having the same page open in Google Chrome doesn't take any noticeable CPU 
time on my laptop.

Also epiphany doesn't seem to have an equivalent to the SHIFT-ESC in Chrome to 
bring up a browser task list.  It would be good to have something like that.

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